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Dr. Jorge Freitas
CQM - Centro de Química da Madeira, University of Madeira, Portugal

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Research Keywords & Expertise

0 Food Quality
0 Sensory Evaluation
0 aquaculture system management
0 Aquaculture environment
0 biotecnology

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Journal article
Published: 05 July 2021 in Foods
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Sugarcane honey (SCH) is a syrup produced on Madeira Island and recognized by its unique aroma, a complex attribute of quality with an important influence on the final consumer’s acceptance of the product, and determined by a complex mixture of a large number of volatile organic compounds (VOCs) generated during its traditional making process and storage. Therefore, the purpose of this study was to establish the volatile profile of genuine SCH produced by a regional certified producer for seven years and compare it with syrups from non-certified regional producers and with producers from different geographical regions (Spain, Egypt, Brazil and Australia), as a powerful strategy to define the volatomic fingerprint of SCH. Different volatile profiles were recognized for all samples, with 166 VOCs being identified belonging to different chemical classes, including furans, ketones, carboxylic acids, aldehydes and alcohols. Chemometric analysis allowed (i) the differentiation between all syrups, being more pronounced between SCH and other syrups; and (ii) the identification of 32 VOCs as potential markers for the traceability and authenticity of SCH on the global market.

ACS Style

Pedro Silva; Jorge Freitas; Fernando Nunes; José Câmara. A Predictive Strategy Based on Volatile Profile and Chemometric Analysis for Traceability and Authenticity of Sugarcane Honey on the Global Market. Foods 2021, 10, 1559 .

AMA Style

Pedro Silva, Jorge Freitas, Fernando Nunes, José Câmara. A Predictive Strategy Based on Volatile Profile and Chemometric Analysis for Traceability and Authenticity of Sugarcane Honey on the Global Market. Foods. 2021; 10 (7):1559.

Chicago/Turabian Style

Pedro Silva; Jorge Freitas; Fernando Nunes; José Câmara. 2021. "A Predictive Strategy Based on Volatile Profile and Chemometric Analysis for Traceability and Authenticity of Sugarcane Honey on the Global Market." Foods 10, no. 7: 1559.

Review
Published: 01 July 2021 in Separations
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Some chemical substances have the potential to enter the coastal and marine environment and cause adverse effects on ecosystems, biodiversity and human health. For a large majority of them, their fate and effects are poorly understood as well as their use still unregulated. Finding effective and sustainable strategies for the identification of these emerging and/or anthropogenic contaminants that might cause polluting effects in marine environments to mitigate their adverse effects, is of utmost importance and a great challenge for managers, regulators and researchers. In this review we will evaluate the impact of emerging contaminants (ECs) on marine coastal zones namely in their ecosystems and biodiversity, highlighting the potential risks of organic pollutants, pharmaceuticals and personal care products. Emerging microextraction techniques and high-resolution analytical platforms used in isolation, identification and quantification of ECs will be also reviewed.

ACS Style

José Câmara; Sarah Montesdeoca-Esponda; Jorge Freitas; Rayco Guedes-Alonso; Zoraida Sosa-Ferrera; Rosa Perestrelo. Emerging Contaminants in Seafront Zones. Environmental Impact and Analytical Approaches. Separations 2021, 8, 95 .

AMA Style

José Câmara, Sarah Montesdeoca-Esponda, Jorge Freitas, Rayco Guedes-Alonso, Zoraida Sosa-Ferrera, Rosa Perestrelo. Emerging Contaminants in Seafront Zones. Environmental Impact and Analytical Approaches. Separations. 2021; 8 (7):95.

Chicago/Turabian Style

José Câmara; Sarah Montesdeoca-Esponda; Jorge Freitas; Rayco Guedes-Alonso; Zoraida Sosa-Ferrera; Rosa Perestrelo. 2021. "Emerging Contaminants in Seafront Zones. Environmental Impact and Analytical Approaches." Separations 8, no. 7: 95.

Review article
Published: 11 March 2021 in Trends in Food Science & Technology
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The Quality Index Method (QIM) is a widely used approach for fish sensory grading, based on a structured scaling for freshness measurements, providing information concerning the fish freshness status, as a prediction of the remaining shelf-life for specific species or products. However, its tendency to be used in an oversimplified way and other common misapplications could lead to discredit of a methodology with great potential. Review the principles of QIM methodology, discussing its concept, applications, and understand their limits, as a useful strategy to propose improvements, reinforce its predictive power and consequent acceptability. Key findings and conclusions: QIM methodology is based on a compromise between the number of fish samples necessary and the number of attributes, with sensory relevance in fish spoilage, that allows verifying if quality requirements are fulfilled. However, the assumptions inherent to the method, undermine the reliability of the shelf-life predictions. Determination of the variability associated with assessors, product, and correct structure of datasets for statistical analysis, will improve the predictive power of the method. However, it could lead to an increase in the method complexity that would drive it away from the industry's needs for fast and easily implemented methods.

ACS Style

Jorge Freitas; Paulo Vaz-Pires; José S. Câmara. Quality Index Method for fish quality control: Understanding the applications, the appointed limits and the upcoming trends. Trends in Food Science & Technology 2021, 111, 333 -345.

AMA Style

Jorge Freitas, Paulo Vaz-Pires, José S. Câmara. Quality Index Method for fish quality control: Understanding the applications, the appointed limits and the upcoming trends. Trends in Food Science & Technology. 2021; 111 ():333-345.

Chicago/Turabian Style

Jorge Freitas; Paulo Vaz-Pires; José S. Câmara. 2021. "Quality Index Method for fish quality control: Understanding the applications, the appointed limits and the upcoming trends." Trends in Food Science & Technology 111, no. : 333-345.

Journal article
Published: 19 September 2020 in Foods
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The volatile amines trimethylamine (TMA) and dimethylamine (DMA) could be used as important spoilage indices for seafood products, assisting in the determination of the rejection period. In the present study, a systematic analytical duality-by-design (AQbD) approach was used as a powerful strategy to optimize the most important experimental parameters of headspace solid-phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS) conditions for the quantification of TMA and DMA in Sparus aurata. This optimization enabled the selection of the best points in the method operable design region for HS-SPME extraction (30 min; 35 °C; NaOH 15 M and NaCl 35%, w/v) and GC-MS analysis (80 °C; gradient 50 °C/min; flow rate 1 mL/min and splitless mode). The rejection day, estimated through the TMA concentration (>12 mg/100 g, at days 9–10), was compared with sensory (quality index method: day 7–8), physical (Torrymeter: day 8–9), and microbial (day 9–10) analysis, corroborating the suitability of the proposed approach for estimating the period for which they will retain an acceptable level of eating quality from a safety and sensory perspective.

ACS Style

Jorge Freitas; Pedro Silva; Paulo Vaz-Pires; José S. Câmara. A Systematic AQbD Approach for Optimization of the Most Influential Experimental Parameters on Analysis of Fish Spoilage-Related Volatile Amines. Foods 2020, 9, 1321 .

AMA Style

Jorge Freitas, Pedro Silva, Paulo Vaz-Pires, José S. Câmara. A Systematic AQbD Approach for Optimization of the Most Influential Experimental Parameters on Analysis of Fish Spoilage-Related Volatile Amines. Foods. 2020; 9 (9):1321.

Chicago/Turabian Style

Jorge Freitas; Pedro Silva; Paulo Vaz-Pires; José S. Câmara. 2020. "A Systematic AQbD Approach for Optimization of the Most Influential Experimental Parameters on Analysis of Fish Spoilage-Related Volatile Amines." Foods 9, no. 9: 1321.

Review article
Published: 16 December 2019 in Aquaculture
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Farmed aquatic products are among the most widely traded commodities and one of the sectors with the fastest growth in the last years. However, aquaculture is still affected by negative connotations in comparison with other agroindustry sectors. Markets, consumer preferences and concerns about food safety and sustainability are influencing the growth of the sector and are forcing the implementation of quality management systems. Modern management systems help to minimize the environmental impacts and the distribution of unsafe or poor-quality products, thereby reducing the potential for bad image, liability and recalls. This article presents a comprehensive overview of the status, relevance, and impact of the quality management systems in the development of marine aquaculture, with the focus on four of the most important criteria associated with these systems: freshness, safety, traceability, and authenticity.

ACS Style

Jorge Freitas; Paulo Vaz-Pires; José S. Câmara. From aquaculture production to consumption: Freshness, safety, traceability and authentication, the four pillars of quality. Aquaculture 2019, 518, 734857 .

AMA Style

Jorge Freitas, Paulo Vaz-Pires, José S. Câmara. From aquaculture production to consumption: Freshness, safety, traceability and authentication, the four pillars of quality. Aquaculture. 2019; 518 ():734857.

Chicago/Turabian Style

Jorge Freitas; Paulo Vaz-Pires; José S. Câmara. 2019. "From aquaculture production to consumption: Freshness, safety, traceability and authentication, the four pillars of quality." Aquaculture 518, no. : 734857.

Journal article
Published: 29 September 2019 in Molecules
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Fish and fish-based products are easily perishable foods due to different factors, including fragile organization, abundant endo-enzymes, psychrophilic bacteria, and impact of pre-harvest operations, that contribute to reducing its value. Therefore, a timely effective method for fish freshness and shelf-life evaluation is important. In this context, this study aimed to develop a sensory scheme based on the Quality Index Method (QIM) (sensory table and point system) for freshness monitorization and shelf-life prediction for Seriola dumerili from aquaculture in Madeira Island. Evaluation of appearance, texture, eyes, and gills was performed during 20 days of storage on ice (0 ± 1 °C). The shelf-life prediction was supported by the analysis of microorganisms (total viable colonies, TVC, counts), texture (Torrymeter), and production of trimethylamine (TMA), evaluated by HS-SPME–GC–MS and validated according to Association of Official Analytical Chemists AOAC guidelines. The result is a QIM scheme with 25 demerit points, where zero indicates total freshness. From the integration of sensory analysis, microbial growth at the time of rejection (TVC, 108 cfu/cm2 and H2S producers, 107 cfu/cm2), texture (Torrymeter value < 8), and TMA analyses (>12.5 mg/100 g), shelf-life was estimated as 12 days (±0.5 days). The obtained results show the high-throughput potential of the developed method for fish freshness assessment and shelf-life prediction. This QIM scheme is a secure way to measure quality and provide users with a reliable standardized fish freshness measure.

ACS Style

Jorge Freitas; Paulo Vaz-Pires; José S. Câmara. Freshness Assessment and Shelf-Life Prediction for Seriola dumerili from Aquaculture Based on the Quality Index Method. Molecules 2019, 24, 3530 .

AMA Style

Jorge Freitas, Paulo Vaz-Pires, José S. Câmara. Freshness Assessment and Shelf-Life Prediction for Seriola dumerili from Aquaculture Based on the Quality Index Method. Molecules. 2019; 24 (19):3530.

Chicago/Turabian Style

Jorge Freitas; Paulo Vaz-Pires; José S. Câmara. 2019. "Freshness Assessment and Shelf-Life Prediction for Seriola dumerili from Aquaculture Based on the Quality Index Method." Molecules 24, no. 19: 3530.

Journal article
Published: 01 March 2017 in Food Control
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ACS Style

Pedro Miguel Capêlo da Silva; Jorge Freitas; Catarina Luís Silva; Rosa Perestrelo; Fernando M. Nunes; José S. Câmara. Establishment of authenticity and typicality of sugarcane honey based on volatile profile and multivariate analysis. Food Control 2017, 73, 1176 -1188.

AMA Style

Pedro Miguel Capêlo da Silva, Jorge Freitas, Catarina Luís Silva, Rosa Perestrelo, Fernando M. Nunes, José S. Câmara. Establishment of authenticity and typicality of sugarcane honey based on volatile profile and multivariate analysis. Food Control. 2017; 73 ():1176-1188.

Chicago/Turabian Style

Pedro Miguel Capêlo da Silva; Jorge Freitas; Catarina Luís Silva; Rosa Perestrelo; Fernando M. Nunes; José S. Câmara. 2017. "Establishment of authenticity and typicality of sugarcane honey based on volatile profile and multivariate analysis." Food Control 73, no. : 1176-1188.

Journal article
Published: 25 July 2016 in Food Chemistry
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Sotolon is widely associated with the quality of fortified aged wines, and has also been linked to premature oxidative aging (premox). Here we developed a single, fast and environmental-friendly microextraction by packed sorbent ultra-high pressure liquid chromatography analysis (MEPS/UHPLC-PDA) for sotolon quantification in different wines. The best extraction conditions (loading three times 250 μL samples through the MEPSPEP sorbent and elution with 100 μL of 50% MeOH) were combined with a fast UHPLC separation (5 min separation using acidified 10% MeOH isocratic flow in a CORTECS C18 column) to allow unparalleled minimum sample and solvents volumes usage. The validated methodology showed good linearity (r2 > 0.993) and precision (81%) and detection limits (0.45–2.51 μg/L) far below sotolon odor threshold for any type of wine. The methodology was successfully applied to selected white table and Madeira wines, encompassing therefore a wide range of alcohol and sugar contents. Furthermore, as far we may know, this is the first time a single methodology can be used to assess both wine aging or premox according to the type of wine.

ACS Style

Jorge Freitas; Rosa Perestrelo; Rubina Cassaca; Mariangie Castillo; Mariana Santos; Jorge Pereira; José S. Câmara. A fast and environment-friendly MEPS PEP /UHPLC-PDA methodology to assess 3-hydroxy-4,5-dimethyl-2(5H)-furanone in fortified wines. Food Chemistry 2016, 214, 686 -693.

AMA Style

Jorge Freitas, Rosa Perestrelo, Rubina Cassaca, Mariangie Castillo, Mariana Santos, Jorge Pereira, José S. Câmara. A fast and environment-friendly MEPS PEP /UHPLC-PDA methodology to assess 3-hydroxy-4,5-dimethyl-2(5H)-furanone in fortified wines. Food Chemistry. 2016; 214 ():686-693.

Chicago/Turabian Style

Jorge Freitas; Rosa Perestrelo; Rubina Cassaca; Mariangie Castillo; Mariana Santos; Jorge Pereira; José S. Câmara. 2016. "A fast and environment-friendly MEPS PEP /UHPLC-PDA methodology to assess 3-hydroxy-4,5-dimethyl-2(5H)-furanone in fortified wines." Food Chemistry 214, no. : 686-693.